FIELD: testing equipment.
SUBSTANCE: stand contains a base on which additional plates are placed with vibration-proof devices fixed to them and recording equipment. On the basis of installed aircraft equipment. One compressor is mounted on standard rubber vibration insulators and another compressor is mounted on the examined dual-mass vibration insulation system, consisting of rubber vibration insulators and an elastically damping intermediate plate with vibration insulators, for example, in the form of plates made of polyurethane, which are placed on the rigid bulkhead mounted on the base through the vibration cushioning gasket, as well as the standard rubber vibration insulators. On a rigid bulkhead, between compressors, a vibration sensor is attached, the signal from which goes to the amplifier and recording equipment, for example an octave spectrometer operating in the frequency band (Hz): 2; 4; 8; 16; 31.5; 63; 125; 250; 500; 1000; 2000; 4000; 8000. Compare the obtained amplitude-frequency characteristics from the operation of each of the compressors and draw conclusions about the effectiveness of the vibration isolation of each system on which they are installed. Imitation of shock impulse loads on each of the systems is performed with the help of a diagnostic shock device containing a body, a piezoelectric dynamometer and a shock element. The impactor is attached to the membrane transfer element fixed to the cylindrical body by means of a flange, perpendicular to the axis of the housing, by means of screws. Inside the housing and coaxially disposed there is a membrane transfer member which has a cylindrical conical part installed in a housing with a toroidal clearance in the lower part having a tab shape in the section of the torus-forming surface. The membrane transmitting element is connected by a threaded part of the stud located along the axis of the housing to the main mass of the impact device contacting the piezoelectric dynamometer placed in the dielectric protective shell. The stress arising from shock or accidental influences is diverted from the piezoelectric dynamometer through a contact element fixed in the casing and connected by a wire to a contact element fixed in the hollow cylindrical handle of the impact device. The wire is fixed in a clamp rigidly connected to the outer surface of the handle, the axis of which is perpendicular to the axis of the housing and which is fixed by means of a threaded part in a threaded hole of the main mass above which there is an additional mass of the impact device in which an axially symmetric threaded hole is inserted into which the threaded part of the protrusion that is integral with the main mass, which in turn is fixed to the body by means of screws. In the end surface of the threaded part of the protrusion, the head of the pin, which connects the main mass of the impactor to the membrane transmission element through a piezoelectric dynamometer, is mounted, which has a central axisymmetric hole through which the smooth cylindrical part of the hairpin passes. The additional mass of the diagnostic shock device, made in the form of a cylinder and located above the main mass, contains a cavity filled with rigid balls, which, in determining the natural frequencies of each of the vibration isolation systems under investigation, perform a random stochastic action imposed on the impact load. On the basis of the stand, a vibration sensor is additionally attached, the signal from which is fed to the amplifier and then to the recording equipment.
EFFECT: expanded technological capabilities of testing the objects, having several elastic couplings with the body parts of the flying object.
5 dwg
